Fuel filler plug



FIG. 1 is a top plan view of a fuel filler plug showing my new design;

FIG. 2 is a side view, the opposite side being a mirror image thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a perspective view thereof. 

CLAIM The ornamental design for a fuel filler plug, as shown and described. 